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Constructive & Destructive Forces on Landforms

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Constructive & Destructive Forces on Landforms 5-3.1 Two Types of Forces Destructive Forces: processes that destroy landforms. 2 types: Slow (weathering) and Fast ... – PowerPoint PPT presentation

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Title: Constructive & Destructive Forces on Landforms


1
Constructive Destructive Forces on Landforms
  • 5-3.1

2
Two Types of Forces
  • Destructive Forces processes that destroy
    landforms.
  • 2 types Slow (weathering) and Fast (Erosion)
  • Ex. landslides, volcanic eruptions, earthquakes,
    floods
  • Constructive forces forces that build up an
    existing landform or create a new one.
  • Caused by water, gravity, wind and glaciers.
  • Ex deposition, landslides, volcanic eruptions,
    floods

3
Weathering
Weathering Pictures
  • Weathering a slow, destructive force that breaks
    rocks into smaller pieces called sediments. Can
    by physical (mechanical) or chemical.
  • Keywords
  • wear down, break
  • apart

4
Mechanical weathering the breaking of rock into
smaller pieces by forces due to gravity, ice,
plant roots, or other physical forces.
5
Chemical Weathering the changing of materials in
a rock by chemical processes.
6
Erosion
Grand Canyon Video
  • Erosion the destructive movement of materials
    away from one place by wind, water, ice and
    gravity.

Wave Erosion- caused by water
Wind Erosion (Dust Storm)
7
Landslides
  • Landslides occur when gravity quickly pulls rock
    and dirt downhill.

8
Floods
  • Floods a great flow of water over an area that
    is usually dry land.

9
Volcanic Eruptions
  • Volcano an opening in the Earths crust through
    which steam, lava and ashes erupt.
  • Cause both destructive and constructive changes
    to landforms.

10
Mount St. Helens
Mount St. Helens Video
Saint Helens Before
Saint Helens After
11
Volcanoes can be constructive, but also
destructive
12
Earthquakes
  • Earthquakes the shaking of Earths surface
    caused by the release of energy along a fault.

San Andreas Fault, California
13
Volcanoes Earthquakes
Tectonic Plates, Volcanoes Earthquakes
14
Erosion Deposition
  • Deposition the placing of materials in a new
    place (constructive force).
  • Ex. Sandbars

15
Water Erosion Deposition
  • River Delta- Deposits of sediment at the mouth of
    the Mississippi River creating new land called a
    delta.

16
Wind Erosion Deposition
  • Sand Dunes- sand is moved by wind

Desert Sand Dunes
Ocean Sand Dunes
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